Christopher D. Brown insider trades: 908 Devices (MASS) stock sales
Trades on the price chart
Daily close, with an arrow on each day they bought or sold
Companies
Where Christopher reports to the SEC
Open-market buys and sales
29 trades reported on SEC Form 4, newest first
| Date | Stock | Type | Shares | Price | Value | Holding | Reported |
|---|---|---|---|---|---|---|---|
| Nov 4, 2026 | MASS | ↓ Sell | 30,000 | $10.95 | $329K | Direct | Nov 6, 2026 (2d) |
| Oct 7, 2026 | MASS | ↓ Sell | 30,000 | $11.89 | $357K | Direct | Oct 9, 2026 (2d) |
| Sep 2, 2026 | MASS | ↓ Sell | 30,000 | $10.58 | $317K | Direct | Sep 4, 2026 (2d) |
| Aug 11, 2026 | MASS | ↓ Sell | 17,800 | $9.12 | $162K | Direct | Aug 12, 2026 (1d) |
| Aug 5, 2026 | MASS | ↓ Sell | 20,000 | $8.49 | $170K | Direct | Aug 7, 2026 (2d) |
| Jul 2, 2026 | MASS | ↓ Sell | 2,200 | $9.02 | $20K | Direct | Jul 7, 2026 (5d) |
| Jun 3, 2026 | MASS | ↓ Sell | 20,000 | $8.73 | $175K | Direct | Jun 4, 2026 (1d) |
| May 28, 2026 | MASS | ↓ Sell | 30,000 | $9.00 | $270K | Direct | May 29, 2026 (1d) |
| May 6, 2026 | MASS | ↓ Sell | 20,000 | $7.23 | $145K | Direct | May 7, 2026 (1d) |
| Apr 10, 2026 | MASS | ↓ Sell | 40,000 | $7.06 | $282K | Direct | Apr 10, 2026 (0d) |
| Feb 3, 2025 | MASS | ↓ Sell | 7,767 | $2.34 | $18K | Direct | Feb 4, 2025 (1d) |
| Feb 1, 2024 | MASS | ↓ Sell | 3,957 | $7.01 | $28K | Direct | Feb 2, 2024 (1d) |
| Dec 21, 2023 | MASS | ↓ Sell | 20,000 | $9.10 | $182K | Direct | Dec 21, 2023 (0d) |
| Jun 7, 2023 | MASS | ↓ Sell | 4,470 | $10.03 | $45K | Direct | Jun 9, 2023 (2d) |
| May 23, 2023 | MASS | ↓ Sell | 10,000 | $10.02 | $100K | Direct | May 25, 2023 (2d) |
| Feb 2, 2023 | MASS | ↓ Sell | 11,564 | $9.91 | $115K | Direct | Feb 3, 2023 (1d) |
| Sep 12, 2022 | MASS | ↓ Sell | 20,000 | $19.58 | $392K | Direct | Sep 14, 2022 (2d) |
| Jul 6, 2022 | MASS | ↓ Sell | 10,000 | $21.28 | $213K | Direct | Jul 8, 2022 (2d) |
| Jun 30, 2022 | MASS | ↓ Sell | 20,171 | $20.20 | $407K | Direct | Jul 1, 2022 (1d) |
| Apr 12, 2022 | MASS | ↓ Sell | 9,829 | $20.06 | $197K | Direct | Apr 14, 2022 (2d) |
| Mar 18, 2022 | MASS | ↓ Sell | 19,900 | $20.06 | $399K | Direct | Mar 21, 2022 (3d) |
| Mar 11, 2022 | MASS | ↓ Sell | 100 | $20.00 | $2K | Direct | Mar 15, 2022 (4d) |
| Jan 5, 2022 | MASS | ↓ Sell | 10,000 | $23.67 | $237K | Direct | Jan 7, 2022 (2d) |
| Dec 1, 2021 | MASS | ↓ Sell | 10,000 | $23.86 | $239K | Direct | Dec 3, 2021 (2d) |
| Nov 3, 2021 | MASS | ↓ Sell | 15,000 | $32.86 | $493K | Direct | Nov 4, 2021 (1d) |
| Oct 6, 2021 | MASS | ↓ Sell | 15,000 | $32.31 | $485K | Direct | Oct 7, 2021 (1d) |
| Sep 1, 2021 | MASS | ↓ Sell | 15,000 | $35.92 | $539K | Direct | Sep 3, 2021 (2d) |
| Aug 4, 2021 | MASS | ↓ Sell | 15,000 | $32.54 | $488K | Direct | Aug 6, 2021 (2d) |
| Jul 7, 2021 | MASS | ↓ Sell | 35,000 | $33.63 | $1.2M | Direct | Jul 8, 2021 (1d) |
Each row is one filing's trades in one stock, summed. Shares and prices are as filed, before any later stock split.
Other MASS insiders
Open-market trades in the last 12 months
About Christopher D. Brown's insider trades
Christopher D. Brown is an insider at 908 Devices (MASS). Since Jul 7, 2021, Christopher has reported no open-market purchases and 29 sales worth $8.0M on SEC Form 4. In the last 12 months: 10 sales ($2.2M).
Their filings also include option exercises (8 filings), grants and awards (3 filings), conversions (1 filing). These aren't open-market trades and aren't counted above.
How to read insider trades
Officers, directors and owners of more than 10% of a company must report trades in its stock on SEC Form 4, usually within two business days. Purchases with their own money are the stronger signal: insiders sell for many reasons (taxes, diversification, a house), but buy for one. See every MASS insider trade, the latest insider trades across the market, or cluster buys, when several insiders buy the same stock within days.